US1631369A

US1631369A - Braking mechanism

Info

Publication number: US1631369A
Application number: US454103A
Authority: US
Inventors: Elmer G Gartin
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1921-03-21
Filing date: 1921-03-21
Publication date: 1927-06-07
Anticipated expiration: 1944-06-07

Description

June 7,1921.

E. G. GARTIN BRAKING MECHANISM,

Filed March 21. 1921 Patented June 7 19. urnr g ELMER" r ce,

. MACHINERY COMPANY, A CORPORATION 0.1 MASSACHUSETTS.

' BRAKING MECHANISM.

Application filed March 21, 1921. Serial No. 454,103.

My invention relatesto braking mechanlsms and more particularly to braking mechanisms for use inconnection with feeding mechanisms of the fluid pressure type. v

An object of my invention is to provide an improved braking mechanism. Another object of my invention is to provide an improved braking mechanism for use in controlling the rate of feed of a feeding mechanism. A further object of nay-invention is to provide an improved braking mechanism for use in connection with that type offiuid pressure feeding mechanisms "used with drilling motors. 'A still furtherobject of my invention is to provide an improved braking mechanism for controlling the rate of feed of that type of drill motor known as a stoper. Other objects of my invention will appear in the course of the following specification and appended claims.

In the accompanying drawings; I have shown for purposes of illustration, one form which my invention'may assume in practice.

In these drawings Y Fig. '1 is a central longitudinal section through the feed cylinder of a drill motor in which 1s incorporated the illustrative form of my improvedbraking mechanism.

Fig. 2 is a-transverse section 'on theline 2 2 ofFig. 1. 7'

' For purposes of illustrati'on'I have disclosedflthe illustrative embodiment of my improved braking mechanism used in con trolling the feed of a rock drill of the type known as a stoper. In drills of this type a percussive motor, whose rear end is illustrated at 1, is fed by 'fluidpressurefeeding" mechanism generally indicated by 2. The feeding means comprises a cylinder 3 having a bore 4 in which a piston generally indicated by 5 is reciprocable.

- The piston 5 herein is provided with a piston rod 6 which is in the present caseof hollow. construction having a bore 7 therein. The piston rod passes through a bushing 8 closing the rear end of the bore 4 of the cylinder 3 and is provided at its lower end with a pointed projection 9-adapted to enabut- 1 ment during drilling operation. Fluid gage the rock or some other suitable pressure is admitted in a well known manner under the control of the valve 10, which also controls by well known; port means (not shown) the motor 1, by way of a' passage 11 to the front end of the cylinderwhere it acts upon the piston 5 to force the cylinder forwardly wlth respect to the piston which is held stationary by re'ason of its abutment against the roclr or other stationary support. The p ston 5 is of multi-pa'rt construction and comprises a member-12 provided with an annular groove 13 in its periphery, in

which groove a pair of substantially sem1- 1 circular brake applying members 14 are provided, these being in turn provided with plungers' '15 which extend radially and which project at their inner ends into a cylindrical bore 16 extending longitudinally through the piston 5. The pistonalso comprises a packing securing ring 17 holding a cup packing 18 of well-known form between it and the portion 12 ofthe piston. Sur-. rounding the members 14 and disposed in the groove 13 isa split band of friction material 20 which, when forced outward by the members 14, frictionally engages the bore 4 of the cylinder and tends to retard the relative movement of J the cylinder with respect to the piston. Suitable packings 19 surround the plungers 15 and tend to preforcing the friction' materialinto engage mentwith the cylinder bore. I Y

Extending longitudinally within the bore 7 of the piston rod 6. is a member 21 which is generally elliptical in cross section and which is provided at its rear end with a vent air passing behind the members 14 and r guide head 22 substantially fitting the bore I 7 of the piston rod. This member 22 is provided with ports 23 to permit fluid pressure to pass to the opposite sides thereof; The member 21 extends through the bore 16,

formed on the piston and at its forwardend is slightly reduced in diameter and turned to circular shape as indicated at 25,=thereby providing .a shoulder 24= -which engages against a stationary shoulder 26 surrounding the portionf25. Asuitable packing 27 surrounds the portion 25 of the member 21 and prevents leakagev of air out of the for ward end of the cylinder. The. reduced portion 25 of the member 21 is made polygonal at its forward end and a suitable handle 28 projecting through a slot 29 in the side wall of a chamber 30-interposed between the front end of. thefeed cylinder and the rear end of the motor 1 is attached to the polygonal portion of the member 21 It will be noted from Fig. 2 that, when the member 21 lies in such an inspection of 1 y relation to the plungers that its minor axis is in alinement with the axes of these plungers, the plungers do not force out the packing in frictional contact with the bore 4: ofthe cylinder and accordingly the cylinder is free to move in respect to the piston without braking action. When, however,

the handle 28 is turned in either direction from its position shown in Figs. 1 and2, it Will be evident that the .member 21 acts as a cam and that irrespective of the position of the feed cylinder relative to the piston, the plungers 15 will be forced. outwardly and the packing material will fric- Vtionall-y engage the bore 4 of the cylinder 3 mechanism is shown at 34.

It will be obvious vthat the piston rod 6 must be maintained unvarying relation, as respects rotation, to the cylinder 3 and accordingly I have provided, by brazing, riveting, or any suitable means, a spline 30 extending longitudinally thereof and engaging in a groove '31 formed in thoclosure bushing 8 at the rear .end of a cylinder 3. Theusual vent 33 is provided in the wall of the cylinder 3, and any air which gets behind the packings is permitted to escape to a space communicating with this vent by ports 32.

From the foregoing description it will be obvious that I have provided braking mechanism of a type which is very convenient to operate in that the .control lever is mounted at one end of the cylinder and in fixed relation to tllGsillll'OttlG valve 10 whereby the operator may readily move his hand be *tween the control means used in the operation of the drill. It will also be obvious that by reason of the improved construction, the efficiency of the braking means does not vary from point to point of the cylinder, but that the connection provided is such as to permit the control of the brake irrespective of the'relative positions of piston and cylinder. 7

lVh'i le I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form 0f the same is used for purposes of illustration and that the invention may be embodied in various other forms without departing from its'spiri't or the scope of the appended claims.

' What "claim new and desire ito secure by Letters Patent is: I

1. Feeding mechanism comprising, in comnation, a stationa y bination, stationary and movable members cooperating to form an expansible chamber feeding motor, means carried by one of said members and f-rictionally engageable with the other, and means-carried by the other of said members for controlling said frictional engaging means.

:2. F eedingmechanism comprising, in combin-ation, relatively stationary and movable members cooperating to form an eXpansible chamber feeding motor, means carried by' one of said members and. frictionally engageable with the other to retard such relative movement, and means carried by the other of said members for mechanicallycontrolling said frictional engaging means.

3. Feeding mechanism comprising, in combination, stationary and movable members cooperating to form. an expansible chamber feeding motor, braking means carried by the stationary member, and means for controlling the braking means carried by the movable member. V

I 4. Feeding mechanism comprising in combination, stationary and movable members cooperating to form an expansible chamber feeding motor, braking means for said movable member carried by said stationary rendering effective the frictional engaging means. a

6. Feeding mechanism ooiiapi'ising, in combination, a stationary member, a member movable relative thereto, said members 00- perating to form an expansible chamber feeding motor, a member carried by the stationary member and adapted frictionally to engage the moving member, and relatively rotatable @means carried by the movable member for rendering effective the frictional engaging means.

7.- Braiking means comprising, in combimember, a movable member, saidwmembers cooperating to form an ezq a nsiblev chamber feeding motor, fric-, tional braking means carried by the stationary member, operating means for the fri,c

. tiona'l i braleing means carriedby the movable member and disposed Within the periphery .of-the. stationary member, and means v:fion

controlling the operating means.

gaging the bore of the cylinder, means extending longitudinally through the piston for rendering said frictional engaging means operative, and controlling means for said last mentioned means carried by the cylinder. p

10. Feeding mechanism comprising, in combination, a cylinder, a piston therein, means carried by the piston for frictionally engaging the bore of the cylinder, and means extending longitudinally through the piston for rendering said frictional engaging means operative rotatable about an axis parallel to a line parallel to the axis of said I cylinder.

cam means cooperating therewith and extending through the piston, and means for controlling the last mentioned means.

12. Feeding mechanism comprising, combination, a cylinder, a piston therein, a brake band carried by one of said members, means for directly applying said brake band carriedby said last mentioned member, andmeans carried by the other of said members for causing operation of said brake band applying means, said means being coaxially arranged with both of said members.

13. Feeding mechanism comprising, in combination, a movable cylinder movable to effect feeding of the device to be fed, a stationary piston, and radially expansible means carried by said piston for restraining the movement of said cylinder.

14. Feeding mechanism comprising in combination, cooperating relatively longitudinally movable elements cooperating to form an expansible chamber feeding motor,

and cam operated means for controlling the movement thereof,said means being located within one of said elements and having controlling means therefor carried by the other element. 1

15. Feeding mechanism comprising, in combination, a cylinder and a piston having relative movement, and cam operated means carried by said piston for restraining movement of said cylinder.

16. Feeding mechanism comprising, in

combination, a movable cylinder movable.

during feed with the device to be fed having a bore formed therein, a stationary piston disposed in said bore, and means for frictionally engaging the surface of said bore for restraining movement of said cylinder.

17. Feeding mechanism comprising, in

combination, stationary and movable members cooperating to form an expansible chamber feeding motor, radially expanding braking means carried by said stationary member, and means carried by said movable member for varying the capacity of the radially expanding braking means.

18. Feeding mechanism comprising, combination, a stationary member and a movable member cooperating to form an expansible chamber feeding motor, means carried by said stationary member for frictionally engaging said movable member, and controlling means carried by said movable member for applying said frictional means.

19. In a drilling mechanism, in combination, a drilling motor, pressure fluid feeding means therefor including a movable cylinder and a stationary piston, means for control ling. the pressure fluid supply thereto, means carried by said piston for restraining the movement of SL1Cl cylinder, and means movable with said cylinder for varying the capacity of said feed restraining means.

20. In a drill mechanism, in combination, a drilling motor, pressure fluid feeding means therefor including a stationary and a movable member, restraining means for said feeding means carried by said stationary member, and means movable with said drilling motor for controlling the pressure fluid supply of the feeding means and the capacity of the feed restraining means.

In testimony whereof I affix mysignature.

ELMER c, GARTIN.